Try Overton's at http://www.overton.com/contactusaf.html
Enter *wheels* in the search box and the first one of the seven that come up
is probably the one you want. It is identical to the two that came on my
P19 Baja trailer. Hand to get a spare after I clipped the curb at a gas
station. Overton's doesn't have a lot of sailboat stuff, but they have neat
stuff others don't. Plus, they're over in your neck of the woods.
Jim Tietjen
P19 #1015 Sevushka
Huntsville, AL